Here is the history, e45z-33, s#g108v02144b, lift was originally giving code 51, found controller shorted- had gotten water in it, installed new rebuilt controller ,worked great for about a month, then one day , little to no travel and display locked up it would only give me traction mode 1 and battery level, it would not allow me to change modes,try password or even tell me seat switch present, called rebuilder, they sent out new rebuilt controller, swapped out, test operate lift, display now working properly, gives me everything it is supposed to but still little to no travel, tried changing pot- no difference, called rebuilder again,explained everything,they sent another controller, same thing everything works properly but little to no travel, do you have any ideas? Oh and the password has been changed so I can not access system to see if I need to calibrate pot. I'm at my wits end please help!